Question about Ektachrome color cast

I recently had a 4x5 Readyload sheet of Ektachrome developed and it came
back with a magenta/cyan (purple) colorcast. Fresh film exposed under
color-corrected flash in a fairly "neutral" environment (meaning the
colorcast was not a result of anything in the room). The colorcast is most
obvious because the background was white paper lit from the key light
source. Is this colorcast a result of process error, such as incorrect
temperature of the process chemicals, or are there other possible reasons?

 

My guess a process error, but could be the film got too warm somewhere?
Or your ambient light creeped in at a shutter speed slow enough.
(although I don' know what light source
would produce that kind of shift)

 

As for the film getting too warm somewhere, it certainly wasn't in my
possession. The film was refrigerated until 24 hrs before use and then
stored in what was room temperature, definitely not warm. I am pretty
conscientious about protecting my film and paper. Thanks for your reply.

 

It sounds like a processing error, but exactly what kind I don't know. In
my very limited experience processing E6 myself I have found color shifts if
my timing on the first developer was off even a little. The other steps are
somewhat more forgiving.

If the film was processed by a lab I doubt timing or temperature would be a
likely issue (most machines are pretty good at doing those things correctly
once dialed in). It might have been exhausted developer.

Sherman
http://www.dunnamphoto.com

 

#1 Exposure through the base...unlikely since it was a Readyload.
#2 Colour Developer ph too low.

 

: I recently had a 4x5 Readyload sheet of Ektachrome developed and it came
: back with a magenta/cyan (purple) colorcast. Fresh film exposed under
: color-corrected flash in a fairly "neutral" environment (meaning the
: colorcast was not a result of anything in the room). The colorcast is most
: obvious because the background was white paper lit from the key light
: source. Is this colorcast a result of process error, such as incorrect
: temperature of the process chemicals, or are there other possible reasons?

It could be a number of things. The first suspect is development problems. This includes
the chemistry, temperature, time, etc. The second is the handling of the film. Did the
film get exposed to heat? The third and one that I've had happen to me more then the
other two is the use of film that has expired.

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